chore(deps): update dependency acorn to v5.4.0

Author: renovate-bot

package.json

@@ -31,7 +31,7 @@
     "define-property": "2.0.2"
   },
   "devDependencies": {
-    "acorn": "5.3.0",
+    "acorn": "5.4.0",
     "clone-deep": "2.0.2",
     "eslint-config-standard-tunnckocore": "1.0.10",
     "espree": "3.5.2",

yarn.lock

@@ -52,9 +52,9 @@ acorn-jsx@^3.0.0:
   dependencies:
     acorn "^3.0.4"
 
-acorn@5.3.0:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.3.0.tgz#7446d39459c54fb49a80e6ee6478149b940ec822"
+acorn@5.4.0:
+  version "5.4.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.4.0.tgz#51c581c9d4b1943dda59a3e73bcf02661ac727ea"
 
 acorn@^3.0.4:
   version "3.3.0"